Title :
Looking Into a Plasma Loudspeaker
Author :
Sutton, Yvonne ; Moore, Jon ; Sharp, David ; Braithwaite, Nicholas St J
Author_Institution :
Dept. of Phys. & Astron., Open Univ., Milton Keynes, UK
Abstract :
A 325-kHz atmospheric discharge can be modulated at audio frequencies so that it acts as a loudspeaker by direct electroacoustic coupling, without any electromechanical components. In exploring the details of the mechanism, it has been useful to visualize the heated gas within and around the discharge plume using Schlieren techniques. This has enabled a 2-D reconstruction of the translational temperature of the neutral gas (up to 2500 K) that complements spectroscopic measurements of rotational and vibrational temperatures (up to 2700 K) in the luminous region.
Keywords :
acoustoelectric devices; high-frequency discharges; loudspeakers; plasma devices; plasma diagnostics; schlieren systems; 2D reconstruction; Schlieren techniques; atmospheric discharge; audio frequencies; direct electroacoustic coupling; discharge plume; frequency 325 kHz; luminous region; neutral gas; plasma loudspeaker; rotational temperature; spectroscopic measurements; temperature 2500 K; translational temperature; vibrational temperature; Coils; Discharges; Loudspeakers; Plasma temperature; Refractive index; Temperature measurement; Acoustic transducers; atmospheric-pressure plasma; loudspeakers; plasma applications;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2011.2165560
